find duplicates and give ranking

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2.50/5 (2 votes)

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How to segregate the duplicate and distinct rows from source table to separate target tables?
source table:

COL1 COL2 COL3
a b c
x y z
a b c
r f u
a b c
v f r
v f r
Target Table 1: Table containing all the unique rows
COL1 COL2 COL3
a b c
x y z
r f u
v f r

Target Table 2: Table containing all the duplicate rows

COL1 COL2 COL3
a b c
a b c
v f r

these is done now i want to link target table 1 to target table 2

Posted 21-Apr-14 20:26pm

aparnaChandras

Updated 29-Apr-14 20:20pm

v4

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King Fisher 28-Apr-14 8:26am

can you Show your Table structure Simply and what you have to do?

4 solutions

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King Fisher · Answer 1 · 2014-04-21T20:53:00

Solution 2

find Duplicates in table:

http://blog.sqlauthority.com/2007/07/11/sql-server-count-duplicate-records-rows/[^]

http://technet.microsoft.com/en-us/library/ms176102.aspx[^]

Posted 21-Apr-14 20:53pm

King Fisher

Updated 24-Apr-14 20:28pm

v2

Herman<T>.Instance · Answer 2 · 2014-04-21T21:02:00

Solution 3

SQL

SELECT [YourColumnName]
FROM
(
    SELECT Row_Number() over (partion by YourColumnName order by YourColumnName) as counter, YourColumnName
    FROM [yourtable]
) as doubles
where doubles.counter > 1

Posted 21-Apr-14 21:02pm

Herman<T>.Instance

Comments

aparnaChandras 22-Apr-14 7:32am

both are worked thank you

aparnaChandras 22-Apr-14 7:34am

now i want to create a table with id of first occurance in duplicate record in one column and id of other occurances of duplicates in other column

Herman<T>.Instance 22-Apr-14 7:39am

where doubles.counter = 1

aparnaChandras 22-Apr-14 7:48am

not getting it exactly

Herman<T>.Instance 22-Apr-14 10:09am

what you don't understand?

Hitesh Varde · Answer 3 · 2014-04-21T20:52:00

Solution 1

Hi,
Use following query for your need and let me know if it helps you.

SQL

SELECT [YourColumnName],
RANK() OVER (
ORDER BY COUNT(*)) AS 'Rank'
FROM [YourTableName]
GROUP BY [YourColumnName]

Thanks,
Hitesh Varde

Posted 21-Apr-14 20:52pm

Hitesh Varde

Comments

Herman<T>.Instance 22-Apr-14 3:00am

RANK() leads to the same number when having equal result in the row

Murugesan22 · Answer 4 · 2014-04-24T21:01:00

Solution 5

try this count duplicate values

SQL

SELECT [ColumnName],
DENSE_RANK() OVER (
ORDER BY COUNT(*)) AS 'Count'
FROM [TableName]
GROUP BY [ColumnName]

Posted 24-Apr-14 21:01pm

Murugesan22

Updated 24-Apr-14 21:02pm

v2

Comments

aparnaChandras 25-Apr-14 5:59am

it will give only exact match columns not likely.
for ex. i have one column like Engine Type ,it has value like ME9,MC4,ME9.1, here ME9 and ME9.1 are same but it'll not consider as per above query